Terri's mistake was marrying Michael, who automatically became her next of kin. He spoke for her, when she could not. Legally, he was her voice when she could not speak.
She also had this accident in a state where food and water are considered life saving measures, and can be removed under the law of Florida.
These are both facts. They determined the outcome of the case. Justice marched forward on a predetermined path. Terri Schiavo died.